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238 lines
7 KiB
PHP
238 lines
7 KiB
PHP
<?php
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/**
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* CDataProvider is a base class that implements the {@link IDataProvider} interface.
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*
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* Derived classes mainly need to implement three methods: {@link fetchData},
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* {@link fetchKeys} and {@link calculateTotalItemCount}.
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*
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* @property string $id The unique ID that uniquely identifies the data provider among all data providers.
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* @property CPagination $pagination The pagination object. If this is false, it means the pagination is disabled.
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* @property CSort $sort The sorting object. If this is false, it means the sorting is disabled.
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* @property array $data The list of data items currently available in this data provider.
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* @property array $keys The list of key values corresponding to {@link data}. Each data item in {@link data}
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* is uniquely identified by the corresponding key value in this array.
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* @property integer $itemCount The number of data items in the current page.
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* @property integer $totalItemCount Total number of possible data items.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @package system.web
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* @since 1.1
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*/
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abstract class CDataProvider extends CComponent implements IDataProvider
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{
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private $_id;
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private $_data;
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private $_keys;
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private $_totalItemCount;
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private $_sort;
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private $_pagination;
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/**
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* Fetches the data from the persistent data storage.
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* @return array list of data items
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*/
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abstract protected function fetchData();
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/**
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* Fetches the data item keys from the persistent data storage.
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* @return array list of data item keys.
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*/
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abstract protected function fetchKeys();
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/**
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* Calculates the total number of data items.
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* @return integer the total number of data items.
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*/
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abstract protected function calculateTotalItemCount();
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/**
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* Returns the ID that uniquely identifies the data provider.
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* @return string the unique ID that uniquely identifies the data provider among all data providers.
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*/
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public function getId()
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{
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return $this->_id;
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}
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/**
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* Sets the provider ID.
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* @param string $value the unique ID that uniquely identifies the data provider among all data providers.
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*/
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public function setId($value)
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{
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$this->_id=$value;
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}
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/**
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* Returns the pagination object.
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* @param string $className the pagination object class name. Parameter is available since version 1.1.13.
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* @return CPagination|false the pagination object. If this is false, it means the pagination is disabled.
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*/
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public function getPagination($className='CPagination')
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{
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if($this->_pagination===null)
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{
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$this->_pagination=new $className;
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if(($id=$this->getId())!='')
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$this->_pagination->pageVar=$id.'_page';
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}
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return $this->_pagination;
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}
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/**
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* Sets the pagination for this data provider.
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* @param mixed $value the pagination to be used by this data provider. This could be a {@link CPagination} object
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* or an array used to configure the pagination object. If this is false, it means the pagination should be disabled.
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*
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* You can configure this property same way as a component:
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* <pre>
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* array(
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* 'class' => 'MyPagination',
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* 'pageSize' => 20,
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* ),
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* </pre>
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*/
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public function setPagination($value)
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{
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if(is_array($value))
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{
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if(isset($value['class']))
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{
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$pagination=$this->getPagination($value['class']);
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unset($value['class']);
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}
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else
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$pagination=$this->getPagination();
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foreach($value as $k=>$v)
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$pagination->$k=$v;
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}
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else
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$this->_pagination=$value;
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}
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/**
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* Returns the sort object.
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* @param string $className the sorting object class name. Parameter is available since version 1.1.13.
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* @return CSort|false the sorting object. If this is false, it means the sorting is disabled.
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*/
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public function getSort($className='CSort')
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{
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if($this->_sort===null)
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{
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$this->_sort=new $className;
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if(($id=$this->getId())!='')
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$this->_sort->sortVar=$id.'_sort';
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}
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return $this->_sort;
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}
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/**
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* Sets the sorting for this data provider.
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* @param mixed $value the sorting to be used by this data provider. This could be a {@link CSort} object
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* or an array used to configure the sorting object. If this is false, it means the sorting should be disabled.
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*
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* You can configure this property same way as a component:
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* <pre>
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* array(
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* 'class' => 'MySort',
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* 'attributes' => array('name', 'weight'),
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* ),
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* </pre>
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*/
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public function setSort($value)
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{
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if(is_array($value))
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{
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if(isset($value['class']))
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{
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$sort=$this->getSort($value['class']);
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unset($value['class']);
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}
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else
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$sort=$this->getSort();
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foreach($value as $k=>$v)
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$sort->$k=$v;
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}
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else
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$this->_sort=$value;
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}
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/**
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* Returns the data items currently available.
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* @param boolean $refresh whether the data should be re-fetched from persistent storage.
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* @return array the list of data items currently available in this data provider.
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*/
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public function getData($refresh=false)
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{
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if($this->_data===null || $refresh)
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$this->_data=$this->fetchData();
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return $this->_data;
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}
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/**
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* Sets the data items for this provider.
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* @param array $value put the data items into this provider.
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*/
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public function setData($value)
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{
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$this->_data=$value;
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}
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/**
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* Returns the key values associated with the data items.
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* @param boolean $refresh whether the keys should be re-calculated.
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* @return array the list of key values corresponding to {@link data}. Each data item in {@link data}
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* is uniquely identified by the corresponding key value in this array.
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*/
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public function getKeys($refresh=false)
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{
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if($this->_keys===null || $refresh)
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$this->_keys=$this->fetchKeys();
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return $this->_keys;
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}
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/**
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* Sets the data item keys for this provider.
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* @param array $value put the data item keys into this provider.
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*/
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public function setKeys($value)
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{
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$this->_keys=$value;
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}
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/**
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* Returns the number of data items in the current page.
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* This is equivalent to <code>count($provider->getData())</code>.
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* When {@link pagination} is set false, this returns the same value as {@link totalItemCount}.
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* @param boolean $refresh whether the number of data items should be re-calculated.
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* @return integer the number of data items in the current page.
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*/
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public function getItemCount($refresh=false)
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{
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return count($this->getData($refresh));
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}
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/**
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* Returns the total number of data items.
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* When {@link pagination} is set false, this returns the same value as {@link itemCount}.
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* @param boolean $refresh whether the total number of data items should be re-calculated.
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* @return integer total number of possible data items.
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*/
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public function getTotalItemCount($refresh=false)
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{
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if($this->_totalItemCount===null || $refresh)
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$this->_totalItemCount=$this->calculateTotalItemCount();
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return $this->_totalItemCount;
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}
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/**
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* Sets the total number of data items.
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* This method is provided in case when the total number cannot be determined by {@link calculateTotalItemCount}.
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* @param integer $value the total number of data items.
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* @since 1.1.1
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*/
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public function setTotalItemCount($value)
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{
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$this->_totalItemCount=$value;
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}
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}
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